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  1. JDK
  2. JDK-8213199

GC abstraction for Assembler::needs_explicit_null_check()

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    • Icon: Enhancement Enhancement
    • Resolution: Fixed
    • Icon: P4 P4
    • 12
    • 12
    • hotspot
    • gc
    • b20
    • generic
    • generic

      GCs (like Shenandoah) may emit additional loads or stores. In the case of Shenandoah, we emit forward pointer loads from offset -8. Those accesses don't match the pattern currently checked in Assembler::needs_explicit_null_check() which means that explicit null checks would be emitted for forwarding pointer loads. But we don't want that because we know that the base object cannot be NULL (everything else would be an error).

            rkennke Roman Kennke
            rkennke Roman Kennke
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